摘要：电力变压器是电力系统中的重要设备,对于电力系统的可靠性起着举足轻重的作用。随着电网对安全性要求的提高,对电力变压器保护的速动性、灵敏性、可靠性要求也越来越高。电力变压器保护特点之一是输入的模拟信号量多,而能否快速、可靠、准确的处理这些模拟量将直接影响变压器保护的性能。以下提出了一种基于DSP技术的变压器微机保护装置。

摘要：对比中阿两国在防雷接地系统设计和施工方面存在的差异;比较铜接地体与热镀锌扁钢接地体的性能;介绍阿尔及利亚工程所用裸铜线及其特制配件;总结接地系统的施工方法。结合实际案例,对建筑物防雷引下线的选择、使用,接地体的设置等问题提出具体方案;强调建筑物外部防雷设计应与结构专业协调配合。

摘要：小户型为套型建筑面积90 m2以下的住宅套型。小户型建筑设计要贯彻"简洁实用,避免大而不当的浪费","功能齐备,不简化、不舍弃使用空间","精心设计,合理利用好每一寸空间"三个指导思想;同时,小户型建筑设计要注意"建筑进深不宜太大","各功能空间设计注重复合利用","精细控制公共空间面积","注重使用空间的灵活性","建筑外形尽量避免过多凸凹"五个关键问题。

摘要：针对近年来居住小区规划设计暴露出的一些问题:如居住小区规划过分追求容积率造成居住品质下降;如居住小区规划重住宅、轻配套,造成居民生活极大的不方便;景观设计过于简单,不方便居民使用;建筑造型与城市大环境严重脱节;户型设计不符合现阶段中国国情等问题进行简要论述并提出解决方法。

摘要：Proton exchange membrane fuel cells(PEMFCs)are considered ideal energy‐conversion devices because of their environmentally friendly nature and high theoretical energy ***,cathodic polarization,which is a result of the sluggish oxygen reduction reaction(ORR)kinetics,is a significant source of energy loss and reduces fuel cell ***,the need to use Pt in commercial Pt/C cathodes has restricted their large‐scale application in fuel cells because of its high cost and poor ***,improvements in the activity and durability of Pt‐based catalyst are required to reduce the amount of Pt required and,thus,costs,while increasing the ORR rate and fuel cell power density and promoting widespread PEMFC *** recent years,atomically ordered Pt‐based intermetallic nanocrystals have received tremendous attention owing to their excellent activity and stability for the ***,in this review,we first introduce the formation of intermetallic compounds from the perspective of thermodynamics and kinetics to lay a theoretical foundation for the design of these *** addition,optimization strategies for Pt‐based ordered intermetallic catalysts are summarized in terms of the catalyst composition,size,and ***,we conclude with a discussion of the current challenges and future prospects of Pt‐based ordered *** review is designed to help readers gain insights into the recent developments in and rational design of Pt‐based intermetallic nanocrystals for the ORR and encourage research that will enable the commercialization of PEMFCs.

摘要：Cathode catalyst layers （CLs） with varying ionomer （Nation） contents were prepared and the direct methanol fuel cell structure and catalytic behavior were investigated as a function of ionomer content. CL roughness and thickness increased with increasing Nation content. Contact angle measurements determined that CL hydrophilicity also increased as a function of Nation content. Poor bonding between the CL, microporous layer, and the proton exchange membrane was obtained when the ionomer content was too low. The electrochemical surface areas （ESAs） were found to increase with increasing Nation content before reaching an asymptote at elevated loading levels. However, upon increasing the ionomer content above 30 wt.%, the water and oxygen mass transler properties were difficult to control. Considering the above conditions, N30 （：30 wt.% Nation） was found to be the optimal level to effectively extend the three-phase boundaries and enhance cell performance.

摘要：随着我国社会经济迅速发展,人们对于生活品质的追求显著提高,同时对于居住环境的要求也得到显著提升。而处于这一背景下,传统工艺美术在现代室内装饰设计内逐步得到重视。对于大部分人群而言,传统工艺美术装饰更加贴合国人的文化习惯。因此,本文对传统工艺美术、现代室内装饰设计进行研究探讨,分析将传统工艺美术用于现代室内装饰设计的价值,明确设计原则,最终制定合理的设计策略,以期为本行业人员提供更多参考意见。

摘要：本文结合阿尔及利亚实际情况及具体案例,对建筑弱电系统工程的选择、使用和设备配置等问题提出具体方案;强调建筑物弱电工程设计应与其他专业协调配合。

摘要：氧还原反应(ORR)是燃料电池能量转换的关键步骤,开发高性能低成本的催化剂以替代铂族贵金属是推动燃料电池商业化的重要途径。本文综述了质子交换膜燃料电池非贵金属M-N_(x)/C型催化剂的最新研究进展,概括了氧还原反应的基础理论,系统展示了先进表征技术对活性位点鉴定和反应机理研究的作用,总结了M-N_(x)/C型催化剂近年来的代表工作和活性突破,阐述了稳定性问题的根源及对应的方案策略,我们认为M-N_(x)/C型催化剂未来的发展方向是理性设计具高位点密度和高稳定性的催化剂。

摘要：汽车覆盖件包边作为覆盖件冲压成形的最后一个步骤,其成形质量对覆盖件边缘的外观质量以及整个覆盖件的外形尺寸精度有着重要的影响。汽车覆盖件包边模具结构的设计决定了最终的包边质量,在整个包边模具的设计中,预弯机构是包边模具设计的关键。包边模结构及工作过程。包边模结构主要由上模座、斜楔驱动机构、下模座、旋转斜楔机构、预弯刀安装座、预弯刀、凸模、主包边刀等组成,如图1所示。